BLE - Call SecInit unconditionally as it is required by low HCI level driver

That module handles random number incomming from the controller. Overhead is low (less than 150 bytes of flash).

Author: pan-

features/FEATURE_BLE/targets/TARGET_CORDIO/source/CordioBLE.cpp

@@ -386,10 +386,8 @@ void BLE::stack_setup()
 
     WsfTimerInit();
 
-#if BLE_FEATURE_SECURITY
+    // Note: SecInit required for RandInit.
     SecInit();
-#endif
-
     SecRandInit();
 
 #if BLE_FEATURE_SECURITY